Yes ill agree that not ALL types of fish are ok in certain aquariums. I think that if you had a 1'x1' tank that was 10' tall i wouldn't recommend it for any fish, but to say all fish aren't ok in smaller footprint tanks is not necessarily 100%. Besides we can't float in all of our space, fish can. I don't even think the tank he is refering to is a 60gal. those dimensions sound a little small (my 75 is 36x15x36). Anyways, im not disagreeing with you im just stating that other possibilities should be considered. I would say in that size tank 6 would be enough. i have 12, my water changes are 5 times a week of more than 100%. fish look like they have PLENTY of swiming space, more than just enough to float.
again not trying to agrue, just simply discussing alternatives.
again not trying to agrue, just simply discussing alternatives.